Date: Sat, 5 Dec 2020 21:15:13 +0000 From: Edward Tomasz =?utf-8?Q?Napiera=C5=82a?= <trasz@freebsd.org> To: Ian Lepore <ian@freebsd.org> Cc: Ronald Klop <ronald-lists@klop.ws>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: rc.d/zpool runs before ada(4) attaches Message-ID: <X8v4YcVF%2BYkEwzcd@brick> In-Reply-To: <786faeee90e79aa0175b298ec859265ff57a3129.camel@freebsd.org> References: <b55604d6-5c23-a590-859c-a52f36386d44@omnilan.de> <1439301337.11.1606815206810@localhost> <08815f92-742c-2934-e746-fd04ca9b4e16@omnilan.de> <286917313.21.1606836130991@localhost> <786faeee90e79aa0175b298ec859265ff57a3129.camel@freebsd.org>
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On 1201T0834, Ian Lepore wrote: > On Tue, 2020-12-01 at 16:22 +0100, Ronald Klop wrote: [..] > > You can define these in /boot/loader.conf: > > #kern.cam.boot_delay="10000" # Delay (in ms) of root mount for CAM > > bus > > #kern.cam.scsi_delay="2000" # Delay (in ms) before probing SCSI > > > > Maybe that helps. > > > > Ronald. > > > > Those settings control waiting before mounting root. Harry's problem > is that root is mounted quickly, before other drives are ready for zfs. > > The zpool script waits for 'disks'. It would be nice if the cam > subsystem had something like a sysctl it set to indicate when initial > probing for disks was done, then there could be an rc.d/camprobe script > with 'PROVIDE: disks' which waits for the probing to complete. I believe such a mechanism already exists, although it might be somewhat misnamed: the vfs.root_mount_hold sysctl. Some rc scripts use the root_hold_wait() function, which uses the sysctl. Perhaps the ZFS scripts should do the same? Note that this is somewhat more involved than just CAM - you also need to wait for GEOM to settle.
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